World politics also plays a part in customs. If our country was at war with another nation our government might impose what's called a trade embargo. This means that anyone in the US is prohibited to export or import goods from that country. Sometimes embargos are even used when we are not at war. We might not buy goods from a country that treats their workers unfairly or does harmful things to the environment. Whatever the case maybe the government usually provides all of this information on their US Customs & Border protection site -- www.cbp.gov.

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